[FEATURE] Replace lurker package

The watch task requires the package »henrikbjorn/lurker«.
The dependencies of this package dont allow using Symfony 4.
Last release of this package was 2016-03-16. So its abdandoned.

Use the drop-in replacement package totten/lurkerlite instead.
Installing this packsge will remove »henrikbjorn/lurker« automatically.

Since the package is a designated drop-in replacement all existing
methods in robo may stay the same.

Closes consolidation#459 consolidation#956 consolidation#973

composer.json

@@ -93,7 +93,7 @@
     },
     "suggest": {
         "pear/archive_tar": "Allows tar archives to be created and extracted in taskPack and taskExtract, respectively.",
-        "henrikbjorn/lurker": "For monitoring filesystem changes in taskWatch",
+        "totten/lurkerlite": "For monitoring filesystem changes in taskWatch",
         "patchwork/jsqueeze": "For minifying JS files in taskMinify",
         "natxet/cssmin": "For minifying CSS files in taskMinify"
     },

src/Task/Base/Watch.php

@@ -101,7 +101,7 @@ public function monitor($paths, \Closure $callable, $events = 2)
     public function run()
     {
         if (!class_exists('Lurker\\ResourceWatcher')) {
-            return Result::errorMissingPackage($this, 'ResourceWatcher', 'henrikbjorn/lurker');
+            return Result::errorMissingPackage($this, 'ResourceWatcher', 'totten/lurkerlite');
         }
 
         $watcher = new ResourceWatcher();